The word “laymor” (saying) seems to be unneeded. The Beer Mayim Chaim explains it’s meaning as follows:
The Gemara says (Eruvin 54A) that Bruriah (the wife of Rav Meir and daughter of Rav Chanaya ben Teradyon) saw a student learning Torah silently. She asked him: “Doesn’t it say (2 Shmuel 23:5): ‘Fully set forth and protected.’ If Torah is fully set forth with all 248 limbs, then it will be protected. If not, it will not be protected.” (She was saying that if one learns out loud, using his mouth, the entire body – all 248 limbs – will feel it, and the Torah will last and not be forgotten. If one does not say the words out loud, however, the Torah will not last.)
The Gemara adds that Rav Eliezer had a student who learned silently. After three years, he forgot his learning. Shmuel told Rav Yehuda that we see that one should learn out loud and that this is a zechus for a long life from the verse (Mishlei 4:22): “For they are life for those who find them (l’motza’eihem), and for all his flesh a healing.” The word should not be read “l’motza’eihem” (for those who find them), but rather, “l’motzi’eihem” (for those who emit them from the mouth).
Accordingly, the pasuk is saying that Torah must be “laymor” – to say – meaning that one should say words of Torah with a full mouth so as to remember them and to merit a long life.
